// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ngene-i2c.c: nGene PCIe bridge driver i2c functions
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*
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* Copyright (C) 2005-2007 Micronas
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*
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* Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
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* Modifications for new nGene firmware,
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* support for EEPROM-copying,
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* support for new dual DVB-S2 card prototype
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*/
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/* FIXME - some of these can probably be removed */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/io.h>
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#include <asm/div64.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/timer.h>
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#include <linux/byteorder/generic.h>
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#include <linux/firmware.h>
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#include <linux/vmalloc.h>
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#include "ngene.h"
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/* Firmware command for i2c operations */
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static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
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u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
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{
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struct ngene_command com;
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com.cmd.hdr.Opcode = CMD_I2C_READ;
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com.cmd.hdr.Length = outlen + 3;
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com.cmd.I2CRead.Device = adr << 1;
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memcpy(com.cmd.I2CRead.Data, out, outlen);
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com.cmd.I2CRead.Data[outlen] = inlen;
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com.cmd.I2CRead.Data[outlen + 1] = 0;
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com.in_len = outlen + 3;
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com.out_len = inlen + 1;
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if (ngene_command(dev, &com) < 0)
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return -EIO;
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if ((com.cmd.raw8[0] >> 1) != adr)
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return -EIO;
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if (flag)
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memcpy(in, com.cmd.raw8, inlen + 1);
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else
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memcpy(in, com.cmd.raw8 + 1, inlen);
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return 0;
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}
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static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
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u8 *out, u8 outlen)
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{
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struct ngene_command com;
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com.cmd.hdr.Opcode = CMD_I2C_WRITE;
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com.cmd.hdr.Length = outlen + 1;
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com.cmd.I2CRead.Device = adr << 1;
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memcpy(com.cmd.I2CRead.Data, out, outlen);
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com.in_len = outlen + 1;
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com.out_len = 1;
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if (ngene_command(dev, &com) < 0)
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return -EIO;
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if (com.cmd.raw8[0] == 1)
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return -EIO;
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return 0;
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}
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static void ngene_i2c_set_bus(struct ngene *dev, int bus)
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{
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if (!(dev->card_info->i2c_access & 2))
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return;
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if (dev->i2c_current_bus == bus)
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return;
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switch (bus) {
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case 0:
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ngene_command_gpio_set(dev, 3, 0);
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ngene_command_gpio_set(dev, 2, 1);
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break;
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case 1:
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ngene_command_gpio_set(dev, 2, 0);
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ngene_command_gpio_set(dev, 3, 1);
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break;
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}
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dev->i2c_current_bus = bus;
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}
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static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
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struct i2c_msg msg[], int num)
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{
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struct ngene_channel *chan =
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(struct ngene_channel *)i2c_get_adapdata(adapter);
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struct ngene *dev = chan->dev;
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mutex_lock(&dev->i2c_switch_mutex);
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ngene_i2c_set_bus(dev, chan->number);
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if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
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if (!ngene_command_i2c_read(dev, msg[0].addr,
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msg[0].buf, msg[0].len,
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msg[1].buf, msg[1].len, 0))
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goto done;
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if (num == 1 && !(msg[0].flags & I2C_M_RD))
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if (!ngene_command_i2c_write(dev, msg[0].addr,
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msg[0].buf, msg[0].len))
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goto done;
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if (num == 1 && (msg[0].flags & I2C_M_RD))
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if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
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msg[0].buf, msg[0].len, 0))
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goto done;
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mutex_unlock(&dev->i2c_switch_mutex);
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return -EIO;
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done:
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mutex_unlock(&dev->i2c_switch_mutex);
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return num;
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}
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static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm ngene_i2c_algo = {
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.master_xfer = ngene_i2c_master_xfer,
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.functionality = ngene_i2c_functionality,
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};
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int ngene_i2c_init(struct ngene *dev, int dev_nr)
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{
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struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
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i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
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strscpy(adap->name, "nGene", sizeof(adap->name));
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adap->algo = &ngene_i2c_algo;
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adap->algo_data = (void *)&(dev->channel[dev_nr]);
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adap->dev.parent = &dev->pci_dev->dev;
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return i2c_add_adapter(adap);
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}
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